<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html
        PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html >
<head>
    <title>测试</title>
    <meta http-equiv="content-type" content="text/html;charset=utf-8"/>
    <link rel="stylesheet" type="text/css" href="pseudo_classes.css" />
</head>
<body style="border-style: solid;border-color: black;border-width: 1px">
<div style="height: 100px;margin-top: 20px;border-style: none;">
    <div style="height: 20px;margin-top: 10px;">
        我是内容
    </div>
</div>
</body>
</html>
